Risk management margin report exported to csv missing quantity field

[shadiakiki1986]

With this, the detailed report cannot be exported properly as the format changed recently.
Wait till dataflow fix it, then update this reader to follow the new format

Published internally at http://192.168.125.58/bugzilla-5.0rc3/show_bug.cgi?id=465

When fixed, convert the detailed risk report as of 27-09 to yml and save as fixture in ffa-php-core